USA Today has updated its massive college football salary database and recently published a piece on the exploding cost of employing a major-college football coach, which has nearly doubled since 2006. The payouts for service-academy coaches haven’t seen that big of a surge, at least in recent years. Navy head coach Ken Niumatalolo still leads the pack, earning a bit more than $1.5 million in 2013. That’s down from $1.6 million last year, but those figures likely all fall under the contract extension signed by the coach, terms undisclosed, in 2011. It’s good enough for 63rd on the overall list.…